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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '412bc73ae838fedfa1dbb90a2df3048d12c2c9cb3cc60052a04b6f2f0901f43f' 
  AND token = 'GUsEaBo1WZK6Egnzc0CpOPAfJxjXeJ1RsgAqKB8SFRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}